Fahrenheit • Celsius • Kelvin, Exercises of Chemistry

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Temperature Scales Section 5.

Mrs. Baldessari Chemistry

• Fahrenheit

• Celsius

• Kelvin

Anders Celsius 1701- Lord Kelvin (William Thomson) 1824-

Gabriel Fahrenheit 1686-

3 Temperature Scales

Notice that 1 kelvin = 1 degree Celsius

Boiling point of water

Freezing point of water

Celsius

100 ˚C

0 ˚C

100˚C

vin

373 K

273 K

100 K

Fahrenheit

32 ˚F

212 ˚F

180˚F

Calculations Using Temperature

• Generally require temp’s in kelvins
• T (K) = t (˚C) + 273.
• Body temp = 37 ˚C + 273 = 310 K
• Liquid nitrogen = -196 ˚C + 273 = 77 K

Fahrenheit Formula

F = 9/5 °C + 32

Celsius Formula

(°F - 32) * 5/9 = °C

Learning Check

The normal temperature of a chickadee is 105.8°F. What is that temperature in °C?

1. 73.8 °C

2. 58.8 °C

3. 41.0 °C

Answer: 41 °C

Learning Check

Pizza is baked at 235 °C. What is that in °F?

1. 455 °f

2. 350°C

3. 400°C

Answer: 455 °F

Exercise

At what temperature does C = F?

• Since °C equals °F, they both should be the same value (designated as variable x ).
• Use one of the conversion equations such as:
• Substitute in the value of x for both T° C and T° F. Solve for x.

Solution

 F 

C

32

 

T T